Type Hints: Putting more Buzz in your Fizz
summary
Shows concrete results: runs mypy and tox, annotates an over‑engineered fizzbuzz implementation, and fixes a real mismatch where returns mix strings and ints by switching to a Union or changing code. Demonstrates reveal_type revealing set[Any], uses forward references in quotes for circular types, and explains @dataclass and typing.NamedTuple plus stub files and type: ignore. Emphasizes which edits make mypy happy and when code refactoring wins.
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chapters (27)
- 0:00Intro
- 1:40Topics
- 3:13Some basic tooling - mypy and fox
- 4:11Installing and Running
- 5:02Sample Project
- 7:35A simple case
- 7:49The Fizz-Buzz Party Game-Sit in a circle and count
- 9:52A Fizz Buzz Solution fizzbuzz2.py
- 11:23A Fizz Buzz Solution With Hints
- 12:54A Fizz Buzz Solution With Erroneous Hints
- 13:46Two Paths Forward
- 14:50Design Strategies
- 16:33Dealing with complex data structures
- 17:20We really wanted a mapping from number to fizz-buzz text
- 19:04Some code
- 20:04mypy needs some convincing
- 20:58Adding clarity
- 21:33Refactoring Phase 1: Simplify the Types
- 22:18Refactoring Phase II: Propagate the Simplifications
- 24:01Forward references and circularity
- 24:35Two Classes with Mutual References
- 26:07Don't Panic
- 27:06Here's the state of a number, FBState
- 28:48Debugging
- 29:57Some Example Code
- 31:16Common Sources of Complexity
- 33:57More Buzz in your Fizz
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